|
26.06.2007 
Thanks to a new engine and exhaust management system from Siemens,
diesel engines will have no difficulty meeting the stringent Euro 5
and Euro 6 emissions limits. In addition to reducing emissions of
particulates and nitrogen oxides, the system’s modular approach cuts
CO2 emissions and boosts fuel efficiency. As a result, diesel engines
will continue to be the more fuel-efficient alternatives to gasoline-powered
drive systems.
The Siemens concept uses a modular approach consisting of optimized
engine processes, exhaust treatment and intelligent engine management.
The modules can be optimally combined for each vehicle or performance
class – from subcompacts all the way up to SUVs. This makes it possible
for all types of diesel automobiles to meet the Euro 5 and Euro 6
emissions standards, which will impose stricter limits for particulates
and nitrogen oxides in 2009 and 2014, respectively.
The new engine- and exhaust gas-management system increases the precision
of the combustion process by optimizing the supply of fuel and oxygen in
the engine. It does this by increasing the injection pressure and the number
of injection phases. In addition, the fuel is injected through a larger
number of smaller holes. And better management of combustion processes is
achieved thanks to the steadily improving precision of engine sensors. To
treat exhaust gas, the concept created by the automotive electronics experts
at Siemens VDO uses not only a particulate filter as required for Euro 5,
but also a NOx adsorber catalyst and a catalytic system for Euro 6-compliant
applications.
Siemens VDO is now working on developing an electronic engine-management
system that could control all imaginable combinations of the modules. The
company’s extensive experience with environmental protection is demonstrated
by a large number of innovations in this field. Piezo injection, for example,
reduces CO2 emissions by three percent compared to conventional diesel direct
injection. Since Siemens VDO introduced diesel piezo common-rail systems in
2000, the technology has cut carbon dioxide emissions by approximately one
million tons.
In gasoline powered automobiles, piezo direct injection even reduces fuel
consumption and CO2 emissions by as much as 20 percent compared to conventional
manifold port injection . A number of other components are enabling the
automotive industry to further improve its CO2 balance, including tire pressure
monitoring systems, assistance systems for more fuel-efficient driving, and
electrical steering aids in place of hydraulic ones. These examples show that
it is already possible to make cars much more environmentally friendly using
today’s technology.
|
